V. Joergens, M. Bonnefoy, Y. Liu, A. Bayo, and S. Wolf. (2014)cite arxiv:1407.7864Comment: Proceeding of 18th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, held in Flagstaff (AZ) on June 9-13, 2014, ed. by G. van Belle & H. Harris.
Abstract
We show that the coolest known object that is probably formed in a star-like
mode is a free-floating planet. We discovered recently that the free-floating
planetary mass object OTS,44 (M9.5, ~12 Jupiter masses, age ~2 Myr) has
significant accretion and a substantial disk. This demonstrates that the
processes that characterize the canonical star-like mode of formation apply to
isolated objects down to a few Jupiter masses. We detected in VLT/SINFONI
spectra that OTS44 has strong, broad, and variable Paschen beta emission. This
is the first evidence for active accretion of a free-floating planet. The
object allows us to study accretion and disk physics at the extreme and can be
seen as free-floating analog of accreting planets that orbit stars. Our
analysis of OTS44 shows that the mass-accretion rate decreases continuously
from stars of several solar masses down to free-floating planets. We
determined, furthermore, the disk mass (10 Earth masses) and further disk
properties of OTS44 through modeling its SED including Herschel far-IR data. We
find that objects between 14 and 0.01 solar masses have the same ratio of the
disk-to-central-mass of about 1%. Our results suggest that OTS44 is formed like
a star and that the increasing number of young free-floating planets and
ultra-cool T and Y field dwarfs are the low-mass extension of the stellar
population.
Description
[1407.7864] The coolest 'stars' are free-floating planets
cite arxiv:1407.7864Comment: Proceeding of 18th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, held in Flagstaff (AZ) on June 9-13, 2014, ed. by G. van Belle & H. Harris
%0 Generic
%1 joergens2014coolest
%A Joergens, V.
%A Bonnefoy, M.
%A Liu, Y.
%A Bayo, A.
%A Wolf, S.
%D 2014
%K 2014 a:Joergens free-floating planets
%T The coolest 'stars' are free-floating planets
%U http://arxiv.org/abs/1407.7864
%X We show that the coolest known object that is probably formed in a star-like
mode is a free-floating planet. We discovered recently that the free-floating
planetary mass object OTS,44 (M9.5, ~12 Jupiter masses, age ~2 Myr) has
significant accretion and a substantial disk. This demonstrates that the
processes that characterize the canonical star-like mode of formation apply to
isolated objects down to a few Jupiter masses. We detected in VLT/SINFONI
spectra that OTS44 has strong, broad, and variable Paschen beta emission. This
is the first evidence for active accretion of a free-floating planet. The
object allows us to study accretion and disk physics at the extreme and can be
seen as free-floating analog of accreting planets that orbit stars. Our
analysis of OTS44 shows that the mass-accretion rate decreases continuously
from stars of several solar masses down to free-floating planets. We
determined, furthermore, the disk mass (10 Earth masses) and further disk
properties of OTS44 through modeling its SED including Herschel far-IR data. We
find that objects between 14 and 0.01 solar masses have the same ratio of the
disk-to-central-mass of about 1%. Our results suggest that OTS44 is formed like
a star and that the increasing number of young free-floating planets and
ultra-cool T and Y field dwarfs are the low-mass extension of the stellar
population.
@misc{joergens2014coolest,
abstract = {We show that the coolest known object that is probably formed in a star-like
mode is a free-floating planet. We discovered recently that the free-floating
planetary mass object OTS,44 (M9.5, ~12 Jupiter masses, age ~2 Myr) has
significant accretion and a substantial disk. This demonstrates that the
processes that characterize the canonical star-like mode of formation apply to
isolated objects down to a few Jupiter masses. We detected in VLT/SINFONI
spectra that OTS44 has strong, broad, and variable Paschen beta emission. This
is the first evidence for active accretion of a free-floating planet. The
object allows us to study accretion and disk physics at the extreme and can be
seen as free-floating analog of accreting planets that orbit stars. Our
analysis of OTS44 shows that the mass-accretion rate decreases continuously
from stars of several solar masses down to free-floating planets. We
determined, furthermore, the disk mass (10 Earth masses) and further disk
properties of OTS44 through modeling its SED including Herschel far-IR data. We
find that objects between 14 and 0.01 solar masses have the same ratio of the
disk-to-central-mass of about 1%. Our results suggest that OTS44 is formed like
a star and that the increasing number of young free-floating planets and
ultra-cool T and Y field dwarfs are the low-mass extension of the stellar
population.},
added-at = {2014-07-31T22:38:56.000+0200},
author = {Joergens, V. and Bonnefoy, M. and Liu, Y. and Bayo, A. and Wolf, S.},
biburl = {https://www.bibsonomy.org/bibtex/2e1bc6f25ea8d4e34e33beba809604bbb/danielcarrera},
description = {[1407.7864] The coolest 'stars' are free-floating planets},
interhash = {d8959fe0de662548b11defcb919d7884},
intrahash = {e1bc6f25ea8d4e34e33beba809604bbb},
keywords = {2014 a:Joergens free-floating planets},
note = {cite arxiv:1407.7864Comment: Proceeding of 18th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, held in Flagstaff (AZ) on June 9-13, 2014, ed. by G. van Belle & H. Harris},
timestamp = {2014-07-31T22:38:56.000+0200},
title = {The coolest 'stars' are free-floating planets},
url = {http://arxiv.org/abs/1407.7864},
year = 2014
}